From: Jian Lin <blueskybreeze@...>
Date: 2010-05-11T13:27:58+09:00
Subject: In Ruby, can the coerce() method know what operator it is th

In Ruby, it seems that a lot of coerce() help can be done by

    def coerce(something)
      [self, something]
    end

that's is, when

    3 + rational

is needed, Fixnum "3" doesn't know how to handle adding a Rational, so
it asks Rational#coerce for help by calling rational.coerce(3), and this
coerce instance method will tell the caller:

    # I know how to handle rational + something, so I will return you
the following:
    [self, something]
    # so that now you can invoke + on me, and I will deal with Fixnum to
get an answer

So what if most operators can use this method, but not when it is (a -
b) != (b - a) situation?  Can coerce() know which operator it is, and
just handle those special cases, while just using the simple  [self,
something] to handle all the other cases where (a op b) == (b op a) ?
(op is the operator).
-- 
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